K2.net

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Does your teacher know you are here trying to get us to do your homework?

k2.NET is a leading edge .net bpm suite, and if you want a document centric workflow then K2.net and sharepoint both are the best choice for any small or medium enterprise.
You can have full life cycle of document management, record management and in sharepoint you can automate entire processess and sharepoint also provides workflow of few types - but with K2.net - you are more likely having pictorial workflow design tool- so using sharepoint workspace you can have versioning feature and somewhere annotation feature where K2.net can give you dashing slate for designing workflow.
This is just a 1% part of what sharepoint and K2.net could provide.